Open AccessMulti-fiber distributed thermal profiling of minimally invasive thermal ablation with scattering-level multiplexing in MgO-doped fibers
Author(s) -
Aidana Beisenova,
Aizhan Issatayeva,
Sultan Sovetov,
Sanzhar Korganbayev,
Madina Jelbuldina,
Zhannat Ashikbayeva,
Wilfried Blanc,
Emiliano Schena,
Salvador Sales,
Carlo Molardi,
Daniele Tosi
Publication year - 2019
Publication title -
biomedical optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.362
H-Index - 86
ISSN - 2156-7085
DOI - 10.1364/boe.10.001282
Subject(s) - reflectometry , materials science , optics , planar , image resolution , multiplexing , distributed acoustic sensing , backscatter (email) , optical fiber , temperature measurement , scattering , fiber optic sensor , optoelectronics , time domain , computer science , telecommunications , physics , wireless , computer graphics (images) , quantum mechanics , computer vision
We propose a setup for multiplexed distributed optical fiber sensors capable of resolving temperature distribution in thermo-therapies, with a spatial resolution of 2.5 mm over multiple fibers interrogated simultaneously. The setup is based on optical backscatter reflectometry (OBR) applied to optical fibers having backscattered power significantly larger than standard fibers (36.5 dB), obtained through MgO doping. The setup is based on a scattering-level multiplexing, which allows interrogating all the sensing fibers simultaneously, thanks to the fact that the backscattered power can be unambiguously associated to each fiber. The setup has been validated for the planar measurement of temperature profiles in ex vivo radiofrequency ablation, obtaining the measurement of temperature over a surface of 96 total points (4 fibers, 8 sensing points per cm 2 ). The spatial resolution obtained for the planar measurement allows extending distributed sensing to surface, or even three-dimensional, geometries performing temperature sensing in the tissue with millimeter resolution in multiple dimensions.